Dear Friends,i want to ask or need help , please let me know if that is possible or not..i am doing the VOIP/VOICE business and i need to know something regarding the Network or IP spoofing.

=> Example i have my own windows Dedicated Server, which is located in Thailand or Germany and i have Full administrator Access via Remote Desktop/Radmin. and my server IP is , let say server A (65.69.24.222) .

here is two more servers which i don't have any kind of access, means these both server is not mine.Server B (77.77.66.11)Server C (99.88.44.22)

OK, now is that possible to send VOICE traffic from Server A (65.69.24.222) to Server C (99.88.44.22) using Server C (99.88.44.22) IP , send/receive both

Please let me know if that is possible, i will b thank full to you for my whole life....

Not really my area of expertise, though I am skeptical of your intentions in the matter. Sorry it is how it goes here with new posters asking for assisting in doing something that may not be exactly ethical. Sending specific traffic to a server not owned by you, falls into that category.

IP spoofing only really works when its on the same subnet, or when the protocol you're using is connectionless. You usually want to spoof an IP to get around some firewall rules, which sounds shady. What are you up to?

With that in mind, most ways of communicating over "VOIP" use both TCP and UDP. The first one known as TCP, is used for reliable transmission of control and signaling data, while UDP is used for unreliable transmission of audio. (It's generally faster. Most "Internet radio streaming services" use UDP for audio as well.)

As TCP needs a 3-way handshake in order to exchange data, spoofing an IP-address will most likely make the 3-way handshake fail, so you won't be able to send control and signaling data if you spoof your IP-address.

UDP on the other hand, does not need a 3-way handshake and it is therefore possible to send audio from a spoofed location. The problem is that the target server will most likely not accept the data / audio as there's no "control data" being sent separately along telling the target server there's going to be an incoming call.

If you want to spoof UDP packets you can use Scapy.

I recommend you read up on TCP and UDP, even if you know it very well as you need more details about how spoofing works with these protocols. You should also study all the other "VOIP" protocols too, especially THOSE you are going to USE, as not all VOIP programs use the same protocols as far as I know.

Scapy is not easy to use and it will require a lot of hard study on your own, including your very own equipment too.

There's no easy way to do what you're trying to do, and even though generally it's almost not possible, remember that nothing is impossible, but what you're trying to do sounds improbable.

Please note that this information is meant for educational purposes only and that you should only test on equipment which you explicitly have permission (in writing) to test on or own legally.

cd1zz wrote:IP spoofing only really works when its on the same subnet, or when the protocol you're using is connectionless. You usually want to spoof an IP to get around some firewall rules, which sounds shady. What are you up to?

let say server A (65.69.24.222) .(let suppose located in Germany)

here is two more servers which i don't have any kind of access, means these both server is not mine.Server B (77.77.66.11) (let suppose located in Netherlands) <-- different subnetServer C (99.88.44.22) (let suppose located in UK) <-- different subnet

OK, now is that possible to send VOICE traffic from Server A (65.69.24.222) to Server C (99.88.44.22) using Server C (99.88.44.22) IP , send/receive both

Please let me know in that case possible? and also please explain what does "or when the protocol you're using is connectionless" actually means

Mike, it doesn't help if you ask the same question several times in the same thread or by PM'ing a lot of users. We've all told you somewhat the same. Please listen to what we're saying because it's the truth and nothing but the truth